CN115138820A - Die for die casting - Google Patents
Die for die casting Download PDFInfo
- Publication number
- CN115138820A CN115138820A CN202210311905.5A CN202210311905A CN115138820A CN 115138820 A CN115138820 A CN 115138820A CN 202210311905 A CN202210311905 A CN 202210311905A CN 115138820 A CN115138820 A CN 115138820A
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- Prior art keywords
- die
- runner
- molten metal
- flow path
- mold
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- 238000004512 die casting Methods 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 claims abstract description 125
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 75
- 230000013011 mating Effects 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 description 21
- 239000007924 injection Substances 0.000 description 21
- 230000000717 retained effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/203—Injection pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2272—Sprue channels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The die casting mold comprises: a fixed die extending in an axial direction along an axis, having a cylindrical shape in which a plunger is movable in the axial direction, and into which molten metal is injected; and a movable mold forming a cavity between the movable mold and the fixed mold in a mold clamping state in contact with the fixed mold. The movable mold has: a flow divider for forming a flow path space portion between the mold and the fixed mold in a mold clamping state, the flow path space portion constituting a part of a molten metal flow path leading from the sleeve to the cavity; a part of the molten metal flow path is formed in the clamped state, and a groove part of a connecting passage extending from the downstream end of the flow path space part to the cavity along the mating surface of the fixed mold and the movable mold is formed. The groove portion has a recessed portion recessed with respect to an inner surface of the groove portion at a position where at least a part of the inner surface overlaps with a downstream end of the flow path space portion when the flow path space portion is viewed from an upstream end to a downstream end in a clamped state.
Description
Technical Field
The present invention relates to a die casting die.
Background
There is known a die casting die used for manufacturing a die cast product by injecting molten metal from a sleeve into a cavity. As such a die-casting die, for example, a die having a fixed die to which a die-casting sleeve is attached and a movable die movable relative to the fixed die, as disclosed in patent document 1, is known.
The die cast sleeve is capable of moving the injection plunger within its interior. Molten metal is poured into the die-cast sleeve. Injecting molten metal within the die casting sleeve into the cavity by advancing the ejection plunger within the die casting sleeve toward the mold. The cavity is a space formed by the fixed die and the movable die.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent laid-open publication No. 2019-93441
However, as in patent document 1, when molten metal is poured into a sleeve and then the molten metal in the sleeve is poured into a cavity by a plunger, a cold-hardened layer in which a part of the molten metal is solidified is formed on the inner surface of the sleeve. In the state where the cold hard layer is formed on the inner surface of the sleeve in this manner, when the molten metal in the sleeve is pushed out by the plunger, the cold hard layer is peeled off from the inner surface of the sleeve by the plunger, and the peeled cold hard layer flows out from the sleeve together with the molten metal. When the chill layer flows into a cavity together with the molten metal, there is a possibility that mechanical characteristics of a die cast product formed by the cavity may be degraded.
Therefore, a die-casting die is desired which can suppress the flow of the cold hardened layer peeled off from the inner surface of the sleeve into the cavity together with the molten metal.
Disclosure of Invention
The invention aims to provide a die casting die which can prevent a cold hard layer peeled from the inner surface of a sleeve from flowing into a cavity together with molten metal.
A die-casting die according to an embodiment of the present invention includes: a fixed die having a sleeve extending in an axial direction along an axis, having a cylindrical shape in which a plunger is movable in the axial direction, and into which molten metal is injected; and a movable mold which forms a cavity with the fixed mold in a mold-clamped state in contact with the fixed mold. The movable mold has: a flow dividing member that forms a flow path space portion between the mold clamping state and the fixed mold, the flow path space portion constituting a part of a molten metal flow path leading from the sleeve to the cavity; and a groove portion that constitutes a part of the molten metal flow path in the clamped state and constitutes a connection passage extending from a downstream side end portion of the flow path space portion to the cavity along a mating surface of the fixed die and the movable die. The groove portion has a recessed portion recessed with respect to an inner surface of the groove portion, at a position where at least a part of the groove portion overlaps with the downstream end portion of the flow path space portion when the flow path space portion is viewed from the upstream end portion to the downstream end portion in the clamped state.
According to the die-casting die of one embodiment of the present invention, the cold-hardened layer peeled off from the inner surface of the sleeve can be suppressed from flowing into the cavity together with the molten metal.
Drawings
Fig. 1 is a diagram schematically showing the structure of a die-casting device according to an embodiment.
Fig. 2 is a sectional view showing the structure of a flow passage space portion of the die-casting die.
Fig. 3 is an enlarged cross-sectional view showing a flow passage space portion of the die-casting die.
Fig. 4 is a view of the groove portion of the movable mold as viewed from the normal direction of the mating surface.
(symbol description)
1. Die casting equipment
2. Injection plunger device
3. Movable disc
4. Fixed disk
10. Die for die casting
11. Movable mould
11a mating surface
11b engraved portion
11c groove part
12. Fixing mould
12a mating surface
12b engraved portion
13. Die cavity
14. Connection path
15. Space part of flow path
16. Flow divider
21. Plunger sleeve
21a path
21b injection hole
21c supply port
22. Plunger head
23. Plunger piston
31. Space part
32. Runner channel
32a Runner upstream side end portion
32b downstream end of pouring channel
32c runner bottom
32d runner top
33. Runner upstream side curved surface portion
34. Curved surface portion at downstream side of pouring gate
40. Concave part
41. Upstream side surface
42. Downstream side surface
43. Upstream side curved surface part
44. Downstream side curved surface portion
L molten metal flow path
P axis
T-shaped cone
Detailed Description
Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated. The dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components, the dimensional ratios of the components, and the like.
In the following description, the direction of gravity in the state where the die casting device 1 is installed is referred to as the "vertical direction", and the direction perpendicular to the direction of gravity of the die casting device 1 and in which the fixed die and the movable die are arranged is referred to as the "horizontal direction". The direction in which the plunger sleeve 21 extends is referred to as the "axial direction".
In the following description, expressions such as "fixed" and "connected" and "attached" (hereinafter, referred to as "fixed" and the like) include not only a case where components are directly fixed to each other, but also a case where components are fixed via other components. In other words, in the following description, expressions such as fixing include direct and indirect fixing of members.
(die casting device)
Fig. 1 is a diagram schematically showing the structure of a die-casting device 1 including a die-casting die 10 of an exemplary embodiment of the present invention. The die casting device 1 is a device for molding a die casting product having a predetermined shape by injecting molten metal as molten metal into a die for die casting 10 by an injection plunger device 2. The die casting device 1 includes a die casting die 10, an injection plunger device 2, a movable platen 3, and a fixed platen 4.
The die-casting die 10 includes: a movable mold 11, the movable mold 11 being fixed to the movable disk 3; and a fixed die 12, the fixed die 12 being fixed to the fixed disk 4. Although not particularly shown, the movable platen 3 is movable in the die casting device 1 in the left-right direction. The stationary platen 4 is fixed to a frame or the like, not shown, of the die casting apparatus 1. Thus, the movable die 11 of the die-casting die 10 is moved in a direction away from the fixed die 12 by moving the movable platen 3 in a direction away from the fixed platen 4. On the other hand, the movable platen 3 is moved in a direction to approach the fixed platen 4, so that the movable mold 11 of the die-casting mold 10 is moved in a direction to approach the fixed mold 12.
The movable die 11 and the fixed die 12 have mating faces 11a, 12a on the opposite faces, respectively. The mating surfaces 11a, 12a are surfaces that come into contact when the movable die 11 and the fixed die 12 are clamped. In the present embodiment, the mating surfaces 11a and 12a extend in the vertical direction.
The movable die 11 has an engraved portion 11b corresponding to the shape of the die-cast product on the mating surface 11 a. The fixed die 12 has an engraved portion 12b corresponding to the shape of the die-cast product on the mating face 12a. Thereby, in a state where the movable mold 11 is closest to the fixed mold 12, the cavity 13 is formed between the movable mold 11 and the fixed mold 12. That is, the cavity 13 is formed by the insertion portion 11b of the movable mold 11 and the insertion portion 12b of the fixed mold 12.
A molten metal is injected from the injection plunger device into the cavity 13 to mold a die-cast product having a predetermined shape. After the die-cast product having the predetermined shape is molded by the die-casting die 10, the movable die 11 is separated from the fixed die 12, whereby the die-cast product can be taken out from the die-casting die 10.
A plunger sleeve 21, a fixed die 12 and a fixed die 4. Typically, the plunger sleeve 21 is a cylindrical metal member extending along the axis P. The plunger sleeve 21 has a passage 21a therein. One end side in the axial direction of the plunger sleeve 21 penetrates the fixed die 12 and is connected to a flow passage space 15 described later. The plunger sleeve 21 is the sleeve of the present invention.
The plunger sleeve 21 has a passage 21a, an injection port 21b, and a supply port 21c. The passage 21a is a passage having a circular cross section extending in the axial direction in the cylindrical plunger sleeve 21.
The injection port 21b is located on one end side of the plunger sleeve 21, that is, one end side of the passage 21a, and opens in the axial direction toward the flow passage space 15 of the die casting mold 10. That is, the injection port 21b is an opening portion for injecting the molten metal in the passage 21a into the flow path space portion 15 of the die casting mold 10.
The supply port 21c is opened upward at an end portion of the side wall of the plunger sleeve 21 opposite to the injection port 21 b. The supply port 21c is an opening for supplying molten metal into the passage 21a.
A cylindrical plunger head 22 of the injection plunger device 2 is disposed in the passage 21a of the plunger sleeve 21 so as to be movable back and forth. The plunger head 22 is located at the tip end of a plunger 23 of the injection plunger device 2. The molten metal supplied from the supply port 21c into the passage 21a is moved to the injection port 21b by the plunger head 22 (arrow in fig. 1) and is injected from the injection port 21b into the flow path space 15. The injection plunger device 2 further includes a drive mechanism, not shown, for reciprocating the plunger 23 in the axial direction.
The movable mold 11 has a groove portion 11c constituting a connection passage 14 connected to the cavity 13 on the mating surface 11 a. The connecting passage 14 connects a flow path space 15 described later and the cavity 13. The connecting passage 14 constitutes a part of a molten metal flow path L through which molten metal flows from the injection port 21b of the plunger sleeve 21 to the cavity 13 in a clamped state in which the movable mold 11 is in contact with the fixed mold 12, and extends from a downstream end of the flow path space portion 15 to the cavity 13 along mating surfaces 11a, 12a of the fixed mold 12 and the movable mold 11. In the present embodiment, the groove portion 11c extends upward from the downstream end of the flow path space portion 15 to the cavity 13 along the mating surfaces 11a and 12a.
Fig. 2 is a sectional view showing the structure of the flow passage space 15 of the die-casting die 10. The movable mold 11 has a splitter 16 that forms a flow path space portion 15 with the fixed mold 12. The flow passage space 15 connects an injection port 21b of the plunger sleeve 21 described later to the connection passage 14. The flow passage space 15 constitutes a part of the molten metal flow passage L connected to the cavity 13 from the injection port 21b of the plunger sleeve 21.
The shunt 16 projects from the movable die 11 toward the fixed die 12 in the clamped state. A clearance between the flow divider 16 and the fixed die 12 is a flow path space portion 15. The flow path space portion 15 includes: a space 31, the space 31 being located between the distal end of the flow divider 16 and the injection hole 21b of the plunger sleeve 21; and a runner 32, the runner 32 being located between an upper portion of the flow divider 16 and the fixed die 12. In the present embodiment, the flow passage space portion 15 extends obliquely upward from the injection hole 21b, which is an outlet of the plunger 23 in the pushing direction of the plunger sleeve 21, toward the mating surfaces 11a, 12a.
In the clamped state, the space portion 31 of the flow path space portion 15 is positioned in the direction in which the molten metal is pushed out by the plunger 23 with respect to the plunger sleeve 21. The space portion 31 is a columnar space extending in the axial direction along the axis P of the plunger sleeve 21. The runner 32 of the flow path space portion 15 constitutes a part of a flow path in which the runner upstream end portion 32a is connected to a part of the space portion 31 and the molten metal flow path L is connected from the space portion 31 to the cavity 13.
When the space portion 31 is viewed along the axial direction in the clamped state, at least a part of the runner upstream-side end portion 32a is connected to an upper portion of the space portion 31. That is, at least a part of the runner upstream end portion 32a is connected to a position radially outward of the space portion 31.
In the clamped state, the runner 32 extends from the space portion 31 toward the connecting passage 14 in a direction intersecting the axis P of the plunger sleeve 21 and away from the axis P. In the present embodiment, the runner 32 extends obliquely upward from the space portion 31 toward the connecting passage 14 in the clamped state. The runner 32 has a runner bottom portion 32c closest to the axis P in each cross section orthogonal to the axis P, and a runner upper portion 32d farthest from the axis P in each cross section orthogonal to the axis P. The runner 32 is seen through a cross section including the axis P, with the runner bottom 32c and the runner upper 32d extending in a direction intersecting and away from the axis P. When the runner 32 is viewed in a cross section including the axis P, the inclination of the runner bottom portion 32c with respect to the axis P may be the same as the inclination of the runner upper portion 32d with respect to the axis P, may be larger than the inclination of the runner upper portion 32d, or may be smaller than the inclination of the runner upper portion 32d.
The runner 32 has a runner upstream side curved surface portion 33 at a runner upstream side end portion 32a and at a corner portion of a flow path through which molten metal flows from the space portion 31 to the runner 32. The runner upstream side curved surface portion 33 has a curved surface curved along the flow direction of the molten metal flowing from the space portion 31 to the runner 32. In the present embodiment, the runner upstream curved surface portion 33 has an arc shape when the die-casting die 10 is viewed in a cross section including the axis P. Thereby, the molten metal smoothly flows from the space 31 into the runner 32.
The runner downstream side end 32b is located further from the axis P than the runner upstream side end 32 a. In the present embodiment, the downstream end 32b of the runner is located above the upstream end 32a of the runner. The runner downstream end 32b is connected to the upstream end 14a of the connecting passage 14.
The runner 32 has a runner downstream side curved surface portion 34 at a runner downstream side end portion 32b and at a corner portion of a flow path through which molten metal flows from the runner 32 to the connecting passage 14. The runner downstream side curved surface portion 34 has a curved surface curved in the flow direction of the molten metal flowing from the runner 32 to the connecting passage 14. In the present embodiment, the gate downstream side curved surface portion 34 has an arc shape when the die-casting die 10 is viewed in a cross section including the axis P. Thereby, the molten metal smoothly flows into the connecting passage 14 from the runner 32.
The movable mold 11 has a recess 40 recessed with respect to an inner surface thereof in a groove portion 11c constituting the connection passage 14. The recess 40 is located at the following position in the inner surface of the groove 11 c: that is, when the flow path space 15 is viewed from the upstream end to the downstream end in the clamped state, at least a part of the flow path space overlaps with the downstream end of the flow path space 15.
In the present embodiment, the recessed portions 40 are located at the following positions in the inner surface of the groove portion 11 c: that is, when the runner 32 is viewed from the runner upstream-side end 32a toward the runner downstream-side end 32b in the clamped state, a position of the runner downstream-side end 32b overlapping the runner bottom 32c, that is, a position of the runner downstream-side end 32b overlapping a portion closest to the axis P is located downstream of the connecting passage 14.
In the present embodiment, the recessed portions 40 are located at the following positions on the inner surfaces of the groove portions 11 c: that is, when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state, a position of the runner downstream end portion 32b overlapping the runner upper portion 32d, that is, a position of the runner downstream end portion 32b overlapping a portion farthest from the axis P is located on the upstream side of the connecting passage 14. In other words, in the present embodiment, the recessed portion 40 is located at the following positions on the inner surface of the groove portion 11 c: in the clamped state, the runner 32 is located below the upper end of the downstream end of the flow space 15 when viewed from the upstream end 32a to the downstream end 32b of the runner.
The recess 40 is preferably located at the following positions in the inner surface of the groove portion 11 c: when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state, the runner is positioned at a position overlapping the runner upper portion 32d in the runner downstream end portion 32b. That is, the recessed portion 40 is preferably located at the following positions in the inner surface of the groove portion 11 c: in the mold clamped state, the runner 32 overlaps a portion of the runner downstream end 32b farthest from the axis P when the runner 32 is viewed from the runner upstream end 32a toward the runner downstream end 32b.
Fig. 3 is an enlarged cross-sectional view showing the flow passage space 15 of the die-casting die 10. When the molten metal flows from the space portion 31 into the runner 32, the molten metal collides from the space portion 31 with the inner surface of the runner 32 farthest from the axis P, as indicated by the thick line arrow in fig. 3. Thereafter, the molten metal flows along the inner surface farthest from the axis P, that is, the runner upper portion 32d, of the inner surfaces of the runner 32 toward the runner downstream side end portion 32b. Therefore, the molten metal that flows into the connecting passage 14 from the downstream side end portion 32b of the runner initially flows into the recess 40.
Thus, when the cold hardened layer formed on the inner surface of the plunger sleeve 21 is peeled off and flows into the connecting passage 14 from the runner 32 together with the molten metal, the cold hardened layer can be retained in the recess 40. Therefore, the cold hardened layer can be suppressed from flowing into the cavity 13 together with the molten metal.
By positioning the recess 40 on the inner surface of the groove 11c as described above, the molten metal that has first flowed into the connecting passage 14 enters the recess 40 and then merges with the molten metal that has subsequently flowed into the connecting passage 14, as indicated by the thin line arrow in fig. 3. This can suppress the entrainment of gas when the molten metal flows through the connecting passage 14.
Fig. 4 is a view of the groove portion 11c of the movable mold 11 as viewed from the normal direction of the mating surface 11 a. As shown in fig. 4, the recessed portion 40 is groove-shaped and extends in the width direction with respect to the groove portion 11c. That is, the recess 40 extends in the width direction of the connection passage 14 with respect to the connection passage 14.
As shown in fig. 3, the concave portion 40 has an upstream side surface 41, a downstream side surface 42, an upstream side curved surface portion 43, and a downstream side curved surface portion 44.
The upstream side surface 41 is a side surface located on the upstream side of the connection passage 14 among the side surfaces of the recess 40. The upstream side surface 41 is an inclined surface located on the downstream side of the connecting passage 14 toward the opening side of the recess 40. The downstream side surface 42 is a side surface located on the downstream side of the connection passage 14 among the side surfaces of the recess 40. The downstream side surface 42 is an inclined surface located on the upstream side of the connection passage 14 as it goes toward the opening side of the recess 40. The upstream side surface 41 is a tapered portion of the present invention. That is, the recess 40 has a tapered portion T at least in a portion of the side surface located on the downstream side of the connection passage 14, and the tapered portion T is separated to the downstream side from a portion of the side surface located on the upstream side of the connection passage 14 toward the opening portion opened to the connection passage 14.
Accordingly, the cold hardened layer flowing into the connecting passage 14 together with the molten metal is retained in the concave portion 40, and thereafter, the molten metal can be smoothly flowed to the downstream side of the connecting passage 14. Therefore, the flow of the molten metal can be suppressed from being obstructed by the recessed portion 40.
Further, since the upstream side surface 41 is an inclined surface located on the downstream side of the connecting passage 14 toward the opening side of the recess 40, the molten metal flowing into the connecting passage 14 from the runner 32 smoothly flows into the recess 40. This enables the chilled layer to be more reliably retained in the recess 40.
The upstream curved surface portion 43 is located on the opening side of the recess 40 of the upstream side surface 41. The downstream curved surface portion 44 is positioned on the opening side of the recess 40 of the downstream side surface 42. That is, the recess 40 has an upstream curved surface portion 43 at a portion on the upstream side of the connection passage 14 in the opening portion to the connection passage 14, and has a downstream curved surface portion 44 at a portion on the downstream side of the connection passage 14 in the opening portion to the connection passage 14. The downstream side curved surface portion 44 is a curved surface portion of the present invention. The upstream curved surface portion 43 and the downstream curved surface portion 44 are located at the peripheral edge portion of the opening of the recess 40, respectively, and have smooth curved surfaces in the flow direction of the molten metal in the connecting passage 14. In the present embodiment, when the die-casting die 10 is viewed in a cross section including the axis P, the upstream curved surface portion 43 and the downstream curved surface portion 44 are each arc-shaped.
As a result, the cold hardened layer flowing into the connecting passage 14 together with the molten metal can be retained in the concave portion 40, and thereafter the molten metal can be smoothly flowed to the downstream side of the connecting passage 14. Therefore, the flow of the molten metal can be suppressed from being obstructed by the recessed portion 40.
Further, as described above, by positioning the upstream side curved surface portion 43 and the downstream side curved surface portion 44 on the opening side of the recessed portion 40, it is possible to suppress the die-cast product from being sintered to the die-casting die 10 and to suppress the die-cast product from being cracked.
The die-casting die 10 of the present embodiment includes: a fixed die 12 having a plunger sleeve 21, the plunger sleeve 21 extending in an axial direction along an axis P, having a cylindrical shape in which a plunger 23 is movable in the axial direction, and into which molten metal is injected; and a movable die 11 that forms a cavity 13 with the fixed die 12 in a clamped state in which the movable die 11 is in contact with the fixed die 12. The movable mold 11 has: a flow divider 16, wherein the flow divider 16 forms a flow path space portion 15 between the fixed mold 12 and the flow path space portion 15 in the clamped state, and the flow path space portion 15 forms a part of a molten metal flow path L connected from the plunger sleeve 21 to the cavity 13; and a groove portion 11c that constitutes a part of the molten metal flow path L in the clamped state and constitutes a connection passage 14 extending from a downstream end of the flow path space portion 15 to the cavity 13 along mating surfaces 12a, 11a of the fixed die 12 and the movable die 11. The groove portion 11c has a recessed portion 40 recessed from the inner surface of the groove portion 11c at a position where at least a part of the inner surface overlaps with the downstream end of the flow path space portion 15 when the flow path space portion 15 is viewed from the upstream end to the downstream end in the clamped state.
After the molten metal is injected into the plunger sleeve 21 until the molten metal in the plunger sleeve 21 is pushed out by the plunger 23, a cold-hardened layer in which a part of the molten metal is solidified is formed on the inner surface of the plunger sleeve 21. When the molten metal in the plunger sleeve 21 is pushed out by the plunger 23, the chilled layer is peeled off from the inner surface of the plunger sleeve 21 by the plunger 23, and the peeled chilled layer flows out from the plunger sleeve 21 together with the molten metal. If the cold hard layer flows into the cavity 13 together with the molten metal, there is a possibility that mechanical characteristics of the die-cast product molded by the cavity 13 are degraded.
On the other hand, as in the configuration of the present embodiment, the groove portion 11c constituting the connecting passage 14 through which the molten metal pushed out from the plunger sleeve 21 by the plunger 23 flows after passing through the inside of the flow passage space portion 15 has the recessed portion 40 at a position overlapping with the downstream end portion when the flow passage space portion 15 is viewed from the upstream end portion to the downstream end portion in the inner surface thereof, whereby the cold hard layer flowing into the connecting passage 14 together with the molten metal can be retained in the recessed portion 40. Therefore, the cold hardened layer can be suppressed from flowing into the cavity 13 together with the molten metal.
Since the groove 11c has the recessed portion 40, the molten metal that has flowed into the connecting passage 14 first enters the recessed portion 40 and then merges with the molten metal that has flowed from behind in the connecting passage 14. This can suppress entrainment of gas when the molten metal flows through the connection passage 14.
In the present embodiment, the flow path space portion 15 includes: a space portion 31, the space portion 31 being positioned in a direction of pushing out the molten metal by the plunger 23 with respect to the plunger sleeve 21 in the mold clamped state; and a runner 32, an upstream end 32a of which is connected to a part of the space 31 and which constitutes a part of a flow path connected from the space 31 to the cavity 13 in the molten metal flow path L. The recess 40 is located at the following positions in the inner surface of the groove portion 11 c: and a position at which the runner 32 overlaps at least a part of the runner downstream end 32b when viewed from the runner upstream end 32a toward the runner downstream end 32b in the clamped state.
Accordingly, the molten metal pushed out of the plunger sleeve 21 by the plunger 23 flows into the space 31 and then flows into the runner 32. Thereafter, the molten metal flows in the connecting passage 14. The recess 40 is located at the following positions in the inner surface of the groove portion 11c constituting the connection passage 14: when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state, the cold hardened layer flowing into the connecting passage 14 together with the molten metal can be retained in the recessed portion 40 at a position at least partially overlapping the runner downstream end portion 32b. Therefore, the cold hardened layer can be suppressed from flowing into the cavity 13 together with the molten metal.
Since the groove 11c has the recessed portion 40, the molten metal that has flowed into the connecting passage 14 first enters the recessed portion 40 and then merges with the molten metal that has flowed from behind in the connecting passage 14. This can suppress the entrainment of gas when the molten metal flows through the connection passage 14.
In the present embodiment, when the space portion 31 is viewed along the axial direction in the clamped state, at least a part of the runner upstream-side end portion 32a is connected to the space portion 31 at a position radially outward. The recess 40 is located at the following positions in the inner surface of the groove portion 11 c: in the mold clamped state, when the runner 32 is viewed from the runner upstream end 32a toward the runner downstream end 32b, the position is located downstream of the connecting passage 14 with respect to a position where the runner bottom 32c closest to the axis P of the runner downstream end 32b overlaps.
As described above, when the space portion 31 is viewed in the axial direction, at least a part of the runner upstream-side end portion 32a is connected to the space portion 31 at a radially outer position, the molten metal flowing out of the space portion 31 flows first to the runner upper portion 32d of the runner 32 which is further from the axis P than the runner bottom portion 32c closest to the axis P.
Therefore, as in the above configuration, in the groove portion 11c constituting the connecting passage 14, the recess 40 is located on the downstream side of the connecting passage 14 from the runner upstream end portion 32a toward the runner downstream end portion 32b than the position where the runner bottom portion 32c closest to the axis P of the runner downstream end portion 32b overlaps, and thus the molten metal flowing first to the runner upper portion 32d of the runner 32 which is further from the axis P than the runner bottom portion 32c closest to the axis P flows into the recess 40. Thereby, the cold hardened layer flowing together with the molten metal flows into the recess 40 and is retained in the recess 40. Therefore, the cold hardened layer can be suppressed from flowing into the cavity 13 together with the molten metal.
Since the groove 11c has the recessed portion 40, the molten metal that first flows into the connecting passage 14 enters the recessed portion 40. Accordingly, the molten metal that first flows into the connecting passage 14 enters the recess 40, and then merges with the molten metal that flows from the rear in the connecting passage 14. Therefore, the entrainment of gas when the molten metal flows in the connecting passage 14 can be suppressed.
In the present embodiment, when the space portion 31 is viewed along the axial direction in the clamped state, at least a part of the runner upstream-side end portion 32a is connected to the space portion 31 at a position radially outward. The recess 40 is located at the following positions in the inner surface of the groove portion 11 c: in the mold clamped state, when the runner 32 is viewed from the runner upstream end 32a toward the runner downstream end 32b, the position of the runner downstream end 32b that overlaps the runner upper portion 32d farthest from the axis P is located upstream of the connecting passage 14.
As described above, when the space portion 31 is viewed in the axial direction, at least a part of the runner upstream end portion 32a is connected to the space portion 31 at a radially outer position, the molten metal flowing out of the space portion 31 first flows to the runner upper portion 32d of the runner 32 farthest from the axis P.
Therefore, as in the above configuration, the recess 40 is located at the following positions in the groove portion constituting the connection passage 14: when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b, the molten metal that has flowed into the runner upper portion 32 farthest from the axis P of the runner 32 flows into the recess 40 earlier than the position where the runner bottom portion 32c farthest from the axis P of the runner downstream end portion 32b overlaps the upstream side of the connecting passage 14. Thereby, the cold hardened layer flowing together with the molten metal flows into the recess 40 and is retained in the recess 40. Therefore, the flow of the cold hardened layer into the cavity 13 together with the molten metal can be more reliably suppressed.
Further, since the groove portion 11c has the recessed portion 40, the molten metal that first flows into the connecting passage 14 more reliably enters the recessed portion 40. Accordingly, the molten metal that has flowed into the connecting passage 14 first enters the recess 40, and then reliably merges with the molten metal flowing from the rear in the connecting passage 14. Therefore, the entrainment of gas when the molten metal flows in the connecting passage 14 can be more reliably suppressed.
In the present embodiment, the runner 32 extends from the space portion 31 to the connecting passage 14 in the clamped state in a direction intersecting the axis P and away from the axis P.
When the molten metal flows from the space portion 31 to the connecting passage 14 in the runner 32 extending in a direction intersecting the axis P of the plunger sleeve 21 and away from the axis P, the molten metal more reliably flows first to the runner upper portion 32d farthest from the axis P in the runner 32.
Therefore, in the groove portion 11c constituting the connection passage 14 connecting the runner downstream end portion 32b, the recess portion 40 is positioned in the position of the present embodiment, and thus the molten metal that has flowed first to the runner upper portion 32d farthest from the axis P in the runner 32 flows more reliably into the recess portion 40. Thereby, the cold hardened layer flowing together with the molten metal flows more reliably into the recess 40, and is more reliably retained in the recess 40. Therefore, the flow of the cold hardened layer into the cavity 13 together with the molten metal can be more reliably suppressed.
In addition, the molten metal that has flowed through the runner 32 having the above-described configuration flows into the connecting passage 14, and then more reliably enters the recess 40. Thereby, the molten metal that flows into the connecting passage 14 first and the molten metal that flows from the rear in the connecting passage 14 are surely merged. Therefore, the entrainment of gas when the molten metal flows in the connecting passage 14 can be more reliably suppressed.
In the present embodiment, the recess 40 is groove-shaped extending in the width direction with respect to the connection passage 14. This enables the chilled layer, which has flowed into the connecting passage 14 together with the molten metal, to be more reliably retained in the recessed portion 40. Therefore, the flow of the cold hardened layer into the cavity 13 together with the molten metal can be more reliably suppressed.
In addition, the molten metal that flows into the connecting passage 14 flows into the recess 40 more reliably. This allows the molten metal that has flowed into the connecting passage 14 first to be more reliably merged with the molten metal that has flowed from behind in the connecting passage 14. Therefore, the entrainment of gas when the molten metal flows in the connecting passage 14 can be more reliably suppressed.
In the present embodiment, the recess 40 has a tapered portion T on a downstream side surface 42 of the side surface located on the downstream side of the connection passage 14, the tapered portion T being spaced further downstream from an upstream side surface 41 of the side surface located on the upstream side of the connection passage 14 toward an opening portion that opens into the connection passage 14.
This makes it possible to smoothly flow the molten metal to the downstream side of the connecting passage 14 after the cold hardened layer flowing into the connecting passage 14 together with the molten metal is retained in the concave portion 40. Therefore, the flow of the molten metal can be suppressed from being obstructed by the recessed portion 40.
In the present embodiment, the recess 40 has a downstream curved surface portion 44 at a portion on the downstream side of the connection passage 14, of the opening portion that opens to the connection passage 14.
This makes it possible to cause the molten metal to smoothly flow to the downstream side of the connecting passage 14 after the cold hardened layer, which has flowed into the connecting passage 14 together with the molten metal, is retained in the concave portion 40. Therefore, the flow of the molten metal can be suppressed from being obstructed by the recessed portion 40.
In the die-casting die 10 of the present embodiment, mating surfaces 11a, 12a of the movable die 11 and the fixed die 12 extend in the vertical direction. The flow passage space portion 15 extends obliquely upward from the outlet of the plunger sleeve 21 in the pushing direction of the plunger 23 toward the mating surfaces 11a, 12a. The groove portion 11c extends upward from the downstream end of the flow path space portion 15 to the cavity 13 along the mating surfaces 11a and 12a. The recess 40 is located at the following positions in the inner surface of the groove portion 11 c: the flow passage space 15 is located below the upper end of the downstream end of the flow passage space 15 when viewed from the upstream end to the downstream end.
In the case of the structure in which the molten metal is pushed up from the flow path space portion 15 to the cavity 13, the molten metal flows along the upper portion of the flow path space portion 15 toward the downstream end portion of the flow path space portion 15.
Therefore, the recess 40 is located at the following position in the inner surface of the groove portion 11c constituting the connection passage 14: when the flow passage space 15 is viewed from the upstream end to the downstream end, the molten metal flowing along the upper portion of the flow passage space 15 can be caused to flow into the recess 40 at a position lower than the upper end of the downstream end of the flow passage space 15. Thereby, the cold hardened layer flowing together with the molten metal flows into the recess 40 and is retained in the recess 40. Therefore, the cold hardened layer can be suppressed from flowing into the cavity 13 together with the molten metal.
(other embodiments)
The embodiments of the present invention have been described above, but the above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the embodiments, and the above-described embodiments may be appropriately modified without departing from the scope of the present invention.
In the embodiment, the movable die 11 moves in the left-right direction with respect to the fixed die 12. Thus, the mating surfaces 11a, 12a of the movable mold 11 and the fixed mold 12 extend in the vertical direction. The groove portion 11c extends upward from the downstream end of the flow path space portion 15 to the cavity 13 along the mating surfaces 11a and 12a. The flow passage space portion 15 extends obliquely upward from an injection hole 21b, which is an outlet of the plunger 23 in the plunger sleeve 21 in the pushing-out direction, toward the mating surfaces 11a, 12a. The runner 32 is connected to an upper portion of the space portion 31. The runner 32 extends obliquely upward from the space 31 toward the connecting passage 14 in the clamped state.
However, the movable die may be moved in a direction other than the left-right direction with respect to the fixed die. Therefore, the direction in which the mating surfaces of the movable mold and the fixed mold extend may be a direction other than the vertical direction. The extending direction of the groove portion may be other than the upward direction. The flow passage space portion may extend in a direction other than obliquely upward. The runner may be connected to a portion other than the upper portion of the space portion. The extending direction of the runner may be other than the obliquely upward direction.
In the above embodiment, at least a part of the runner upstream side end portion 32a is connected to the space portion 31 at a position radially outward when the space portion 31 is viewed in the axial direction in the clamped state where the movable mold 11 is in contact with the fixed mold 12. However, at least a part of the upstream end of the runner may be connected to the space portion at a radially inner position when the space portion is viewed in the axial direction in the clamped state.
In the above embodiment, the runner 32 extends from the space portion 31 to the connecting passage 14 in the clamped state in a direction intersecting the axis P and away from the axis P. However, the runner may extend from the space portion to the connecting passage in a direction intersecting with and approaching the axis P in the clamped state, or may extend parallel to the axis P.
In the embodiment, the recess 40 is located at the following positions in the inner surface of the groove portion 11 c: in the mold clamped state, when the runner 32 is viewed from the runner upstream end 32a toward the runner downstream end 32b, the position of the runner downstream end 32b that overlaps the runner bottom 32c closest to the axis P is located downstream of the connecting passage 14. However, the concave portion may be located at the following positions in the inner surface of the groove portion: and a position where the runner bottom portion closest to the axis overlaps with the downstream side end portion of the runner when the runner is viewed from the upstream side end portion to the downstream side end portion in the mold clamped state.
In the embodiment, the recess 40 is located at the following position in the inner surface of the groove portion 11 c: in the mold clamped state, when the runner 32 is viewed from the runner upstream end 32a toward the runner downstream end 32b, the position of the runner downstream end 32b that overlaps the runner upper portion 32d farthest from the axis P is located upstream of the connecting passage 14. However, the recess may be located at the following position in the inner surface of the groove portion: when the runner is viewed from the upstream end to the downstream end in the clamped state, the downstream end of the runner overlaps with the runner upper portion 32d farthest from the axis.
In the embodiment, the recess 40 is groove-shaped extending in the width direction with respect to the connection passage 14. However, the recess may be located at a part in the width direction with respect to the connection passage.
In the embodiment, the recess 40 has a tapered portion T on a downstream side surface 42 of the side surface located on the downstream side of the connection passage 14, the tapered portion T being separated downstream from an upstream side surface 41 of the side surface located on the upstream side of the connection passage 14 toward an opening portion that opens to the connection passage 14. However, the recess may not have a taper. The concave portion may have a tapered portion on a downstream side surface of the side surface on a downstream side of the connection passage.
In the embodiment, the recess 40 has a downstream curved surface portion 44 in a portion downstream of the connection passage 14 in the opening portion that opens to the connection passage 14. The recess 40 has an upstream curved surface portion 43 at an upstream side portion of the connection passage 14 in an opening portion that opens to the connection passage 14. However, the recess may not have the downstream curved surface portion. The recess may not have an upstream side curved surface portion.
The present invention can be used for a die-casting die for manufacturing a die-cast product.
Claims (9)
1. A die for die casting includes:
a fixed die having a sleeve extending in an axial direction along an axis, being cylindrical in shape in which a plunger is movable in the axial direction, and into which molten metal is injected; and
a movable mold that constitutes a cavity between the movable mold and the fixed mold in a mold-clamped state in contact with the fixed mold, wherein,
the movable mold has:
a flow distribution member that forms a flow path space portion between the mold clamping state and the fixed mold, the flow path space portion constituting a part of a molten metal flow path that leads from the sleeve to the cavity; and
a groove portion that constitutes a part of the molten metal flow path in the clamped state and constitutes a connection passage extending from a downstream side end portion of the flow path space portion to the cavity along a mating surface of the fixed die and the movable die,
the groove portion has a recessed portion recessed with respect to an inner surface of the groove portion, at a position on the inner surface where at least a part of the groove portion overlaps with the downstream end portion of the passage space portion when the passage space portion is viewed from the upstream end portion to the downstream end portion in the clamped state.
2. The die-casting die according to claim 1, wherein,
the flow path space section includes:
a space portion located in a direction in which the molten metal is pushed out by the plunger with respect to the sleeve in the clamped state; and
a runner, an upstream side end portion of which is connected to a part of the space portion and which constitutes a part of a flow path leading from the space portion to the cavity in the molten metal flow path,
the concave portion is located at the following position in the inner surface of the groove portion: and a position at which at least a part of the runner overlaps with the downstream end portion of the runner when the runner is viewed from the upstream end portion to the downstream end portion in the clamped state.
3. The die-casting die according to claim 2,
at least a part of the upstream end of the runner is connected to the space portion at a radially outer position when the space portion is viewed in the axial direction in the clamped state,
the concave portion is located at the following position in the inner surface of the groove portion: and a position on a downstream side of the connecting passage with respect to a position overlapping with a portion of the downstream end portion of the runner closest to the axis when the runner is viewed from the upstream end portion to the downstream end portion in the clamped state.
4. The die-casting die according to claim 3,
at least a part of the upstream end portion of the runner is connected to the space portion at a position radially outside when the space portion is viewed in the axial direction in the clamped state,
the concave portion is located at the following position in the inner surface of the groove portion: when the runner is viewed from the upstream end portion to the downstream end portion in the clamped state, the runner is located upstream of the connecting passage with respect to a position overlapping with a portion of the downstream end portion of the runner that is farthest from the axis.
5. The die-casting die according to claim 3 or 4,
the runner extends from the space portion to the connecting passage in the clamped state in a direction intersecting the axis and away from the axis.
6. The die-casting mold according to any one of claims 1 to 5,
the recess is groove-shaped extending in the width direction with respect to the connection passage.
7. The die-casting mold according to any one of claims 1 to 6,
the recess has a tapered portion at a portion of the side surface located on a downstream side of the connection passage, the tapered portion being spaced apart from a portion of the side surface located on an upstream side of the connection passage toward the opening portion opened to the connection passage toward a downstream side.
8. The die-casting mold according to any one of claims 1 to 7,
the recess is in an opening part opened to the connection passage has a curved surface portion at a portion on a downstream side of the connection passage.
9. The die-casting mold according to any one of claims 1 to 8,
mating faces of the movable die and the fixed die extend in the up-down direction,
the flow path space portion extends obliquely upward from an outlet of the sleeve in the direction of pushing out the plunger toward the mating surface,
the groove portion extends upward from the downstream end of the flow path space portion along the mating surface to the cavity,
the concave portion is located at the following position in the inner surface of the groove portion: the flow passage space portion is located below an upper end portion of the downstream end portion of the flow passage space portion when the flow passage space portion is viewed from the upstream end portion toward the downstream end portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021058580A JP2022155193A (en) | 2021-03-30 | 2021-03-30 | Die-casting metal mold |
| JP2021-058580 | 2021-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115138820A true CN115138820A (en) | 2022-10-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210311905.5A Withdrawn CN115138820A (en) | 2021-03-30 | 2022-03-28 | Die for die casting |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2022155193A (en) |
| CN (1) | CN115138820A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003305555A (en) * | 2002-04-11 | 2003-10-28 | Fujino Gijutsu Consultant:Kk | Apparatus and method for die casting |
| JP2004141893A (en) * | 2002-10-22 | 2004-05-20 | Toyota Motor Corp | Die-casting metallic mold |
| CN1748909A (en) * | 2005-08-02 | 2006-03-22 | 陆如辉 | Press casting mould of magnesium alloy gear box |
| CN103003009A (en) * | 2010-10-13 | 2013-03-27 | 三菱重工业株式会社 | Die-casting die |
| CN206382536U (en) * | 2016-07-13 | 2017-08-08 | 顾莹 | Thin-wall part die casting and die-cast formation equipment |
| CN211679958U (en) * | 2019-09-27 | 2020-10-16 | 株式会社阿雷斯提 | Flow divider and casting device |
| CN212761042U (en) * | 2020-05-27 | 2021-03-23 | 湖南轩圣模型制造有限公司 | Die casting die and die forging machine |
-
2021
- 2021-03-30 JP JP2021058580A patent/JP2022155193A/en active Pending
-
2022
- 2022-03-28 CN CN202210311905.5A patent/CN115138820A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003305555A (en) * | 2002-04-11 | 2003-10-28 | Fujino Gijutsu Consultant:Kk | Apparatus and method for die casting |
| JP2004141893A (en) * | 2002-10-22 | 2004-05-20 | Toyota Motor Corp | Die-casting metallic mold |
| CN1748909A (en) * | 2005-08-02 | 2006-03-22 | 陆如辉 | Press casting mould of magnesium alloy gear box |
| CN103003009A (en) * | 2010-10-13 | 2013-03-27 | 三菱重工业株式会社 | Die-casting die |
| CN206382536U (en) * | 2016-07-13 | 2017-08-08 | 顾莹 | Thin-wall part die casting and die-cast formation equipment |
| CN211679958U (en) * | 2019-09-27 | 2020-10-16 | 株式会社阿雷斯提 | Flow divider and casting device |
| CN212761042U (en) * | 2020-05-27 | 2021-03-23 | 湖南轩圣模型制造有限公司 | Die casting die and die forging machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022155193A (en) | 2022-10-13 |
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Application publication date: 20221004 |